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Bicycle Parts - By Owner for sale in Boulder, CO

  1. Khaki Bike Seat, Like New
    $10
    Boulder, CO
  2. RokForm v3 stem mount. Free!
    $0
    Boulder
  3. Jagwire Road Pro 2x Cable Kit
    $50
    Boulder
  4. Paul Klamper short throw caliper (single) flat mount
    $250
    Boulder
  5. Rear Rack
    $10
  6. Blackburn Trackstand Fluid Indoor Bicycle Trainer
    $80
    Louisville
  7. Full Carbon Cannondale Ultrax Disc fork
    $199
    Aurora Now $129!!!
  8. NEW with Tag - Women's Pearl Izumi Thermal Bibs
    $75
    Longmont
  9. Unused $200 Rudy Project Airstorm Cycling Helmet
    $100
    SW Longmont
  10. Simonetti Aero Aluminum Bike Frame - 21 inch
    $250
    Longmont
  11. $100 Women's Mt Bike Shorts - NEW with Tags
    $40
    Longmont
  12. Shimano Ultegra 11-30t 12-spend Cassette and Chain
    $150
    South Boulder
  13. Specialized 100 mm Pro SL Alloy 4-bolt Stem
    $50
    South Boulder
  14. CycleOps Fluid 2 Bike Trainer
    $50
    Downtown Boulder
  15. Shimano sz 39 women's SPD shoes
    $10
    Boulder
  16. Keen SPD bike sandals sz 5
    $20
    Boulder
  17. Shimano womens SPD bike shoes sz 41
    $20
    Boulder
  18. Fox performance fork
    $400
    Lafayette
  19. Shimano R110 Cycling Shoes - Size 45 1/2
    $20
    Boulder
  20. LOOK F ARC Clipless Bicycle Pedals
    $20
    Boulder
  21. NEW 170mm 30t SRAM NX Eagle DUB Wide Crankset
    $100
    South Boulder
  22. Full Carbon Cannondale Ultrax Disc fork
    $199
    Aurora Now $149!!!!
  23. White Industries twenty hole road hub
    $99
    Aurora Now $79!!!!!
  24. New! Extra Wide Road Bike Tire - 700x38
    $15
    SW Longmont
  25. Pearl Izumi Cycling Shoes - sz 45.5
    $40
    Longmont
  26. Travel Trac Fluid+ Bicycle Trainer with Remote & Front Wheel Stand
    $100
    Louisville
  27. Cyclops Indoor Bike Trainer
    $80
    Boulder
  28. Kurt Kinetic Road Machine Resistance Fluid Cycling Trainer
    $120
    Boulder
  29. saddle bags basket
    $40
    Longmont
  30. (2) NEW IN BOX! Yakima LockJaw Rooftop Bike Trays
    $200
    Longmont
  31. Louis Garneau Ergo Air Carbon Cycling Shoes - size EU 42
    $75
    Longmont
  32. Stumpjumper EVO Alloy Frameset (S4)
    $950
    South Boulder
  33. Shimano Hydraulic Mineral Oil, 1 liter
    $20
    Louisville
  34. Shimano disc brake bleed kit
    $15
    Louisville
  35. Kuat Bicycle Rack Carrier PART
    $80
    South Boulder
  36. Cateye HL-EL600RC Single Shot Headlight
    $25
    South Boulder
  37. Saris Bones 3 Bicycle Rack
    $90
    South Boulder
  38. NEW 180mm 200mm SRAM Centerline Brake Rotors
    $30
    South Boulder
  39. NIB e*thirteen Helix Race 12 speed 9-45 Cassette
    $260
    Louisville
  40. Thule T2 XTR - Two Bike Hitch Rack
    $350
  41. Two RockyMounts Rooftop Bike Racks
    $250
  42. Bike Wheels and Trailer
    $100
    Boulder
  43. Bike wheels and Trailer designed for transporting children
    $100
  44. trunk mount bike rack
    $20
    Boulder
  45. Bike trailer for kids/dogs/beer
    $40
    Boulder
  46. 10-50 12 speed SRAM X01 XG 1295 Eagle Cassette XO1 10 50 tooth 12s
    $150
    South Boulder
  47. Biking Clothes - Men's S,M,L
    $15
    Longmont
  48. Park Tool Work Stand
    $80
    Boulder
  49. Bike repair stand
    $20
    Lafayette
  50. Specialized Bridge Saddle 143mm
    $35
    Lafayette
  51. Specialized Stout Pro Handlebars
    $20
    Lafayette
  52. Shimano Ultegra Direct Mount Brakes
    $100
    Louisville
  53. Giant Contact SLR Seatpost 400x27.2
    $40
    Louisville
  54. Dura-Ace Di2 ST-R9150 Shifter Set
    $200
    Louisville
  55. Road Bike Parts
    $1
    Louisville
  56. Tacx Neo Smart Bike Trainer Gen 1
    $200
    Boulder
  57. Rockshox Recon Gold RL 29" 100mm
    $65
  58. Industry Nine Enduro 305 Wheelset 29in 15x110mm/12x148mm 6-Bolt XD Tur
    $1,000
    Berthoud
  59. Kuat Piston Pro X Hitch Rack Add-On Galaxy Grey 2-Bike
    $1,100
    Berthoud
  60. Thule T2 Classic - 2-BIKE ADD-ON HITCH RACK BLACK, 2IN
    $300
    Berthoud
  61. QERIDOO Speedkid1, buggy, walker, jogger Petrol
    $225
    Berthoud
  62. Dog trailer
    $80
  63. 700c commuter wheelset, internal hub
    $150
  64. Studded winter tires
    $50
  65. Small 26” hardtail frame
    $40
  66. 700c fenders
    $20
  67. Maxxis Minion DHR II MTB Tire 27.5x2.6
    $25
    Longmont
  68. Cat Eye Bicycle Light
    $10
    Longmont
  69. Bike Helmets - men's, women's - 6 available
    $10
    Longmont
  70. NEW Mt Bike Tires - 26"
    $25
    Longmont
  71. MTB parts for sale - parting out complete bike
    $1
    Gunbarrel
  72. Paul seatpost clamp, 33.1
    $80
    North Boulder
  73. Fizik Arione--Brown!
    $80
    Boulder
  74. Chris King headset, new
    $150
    Boulder
  75. Shimano RS785 brake calipers
    $40
    Boulder
  76. Surly Extraterrestrial 27.5" tire
    $20
    Boulder
  77. Paul Klampers & Canti Levers
    $500
    North Boulder
  78. Eriksen titanium seatpost, 30.9
    $220
    North Boulder
  79. New Tan Wall Schwalbe G1 Bite Tires 45-622, 28x1.70
    $50
    Boulder
  80. Carbon Fork NOS
    $80
    Longmont
  81. Clearing the shed
    $1
    Lafayette
  82. KS Lev Ci CARBON Dropper Post 31.6 x 490mm (175mm drop)- BRAND NEW
    $245
  83. Maxxis Agressor 29x2.3 EXO TR - BRAND NEW - Pair
    $95
    Broomfield
  84. Pro Stealth Off-road and Fabric Scoop saddles
    $30
    Boulder
  85. Vintage XT rear derailleur
    $50
    Longmont
  86. Mallet 3 Crank Brothers pedals
    $80
    Longmont
  87. 32T Shimano Deore XT FC-M8100-1 Chainring
    $55
    Broomfield
  88. NEW Mountain Bike Shoes - size EUR 41
    $40
    Longmont
  89. NEW! BOA Cycling Shoes with Cleats, Covers
    $100
    Longmont
  90. Brand New 26" Street Tires
    $30
    Longmont
  91. LIKE NEW! Mountain Bike Shoes - SPD - size EU 37.5
    $40
    Longmont
  92. Men's Biking Clothing
    $20
    Longmont
  93. Thule Circuit XT Fork Mount Bike Racks
    $30
    South Boulder
  94. Kenda Honey Badger DH pro 27.5x2.4 tire new
    $10
    Boulder
  95. Garmin Edge 830
    $200
    Boulder
  96. Yakima EZ plus 1 New in Box
    $160
    Lafayette
  97. NEW with tag! Pearl Izumi Elite Women's Thermal Bibs
    $75
    Longmont
  98. Enve SES 2.2 Carbon Hub Rim Brake Wheelset
    $1,400
  99. Ultradynamico Mars 29x2.22? tires
    $100
    Boulder
  100. Knight Composites Clincher Alloy Tubeless Disc Wheelset
    $300
    Superior
  101. Brand new bicycle parts
    $40
    Boulder
  102. Lezyne Travel cnc floor pump
    $50
    Boulder
  103. ZIPP 303 Firecrest 650b Tubeless Disc Wheelsret
    $750
    Superior
  104. Full Carbon Cannondale Ultrax Disc fork
    $199
    Aurora Now $129!!!!
  105. Bike Trainer - Garmin Tacx Neo 2T
    $500
    Boulder
  106. Bontrager Race Lite 700x32 tires (2)
    $30
    Longmont
  107. Neuvation R350 Aero Bicycle Wheel
    $50
    South Boulder
  108. Sidi Shot 2 40 EU
    $200
    Boulder
  109. Panaracer Gravelking 700c x 26c used tires
    $15
    Longmont
  110. New SRAM Level T 2 Piston Brake Calipers
    $15
    Boulder
  111. Race Face Vault Front Hub - 15x110mm, 32H, 6 Bolt
    $75
    Boulder
  112. Giro Ventana BOA MTB/Gravel Bike Shoe - EU42 - US 9
    $25
    Boulder
  113. Clapped Giro Code Techlace MTB/CX Clipless Shoes EU42 - US 9
    $15
    Boulder
  114. NEW! $175 Cycling Shoes with BOA, Cleats, Covers
    $100
    Longmont
  115. Shimano RX8 Shoes - Size 46
    $114
    South Boulder
  116. bike hitch-4bikes
    $75
    Boulder
  117. Maxxis Ardent 26” - 26 inch - Tire (New) & 2 other 26” tires (used)
    $35
    Boulder
  118. Cold weather biking shoe covers
    $25
    Nederland
  119. Kuat Transfer 3
    $250
    Renaissance Longmont
  120. FOX Factory 36, 27.5 / 27.5+, 140mm, Fork
    $250
    Louisville
  121. Giro Empire ACC reflective new 42
    $100
  122. Rapha long sleeve core jersey
    $60
  123. Bike Project: Steel Bike Frame with parts
    $25
    Longmont
  124. Bontrager Carbon Cycling Shoes with eSoles - sz 45
    $80
    Longmont
  125. RockyMounts Monorail Hitch Rack
    $400
    Louisville
  126. GORE Bike Wear $100+ GORE-TEX Shoe Covers
    $50
    Longmont
  127. Shimano Ultegra Bottom Bracket
    $10
  128. Specialized Body Geometry SL OrthoticFootbed
    $20
    South Boulder
  129. Kuat U-BAR Top Tube Cross-bar Adapter – New, unused
    $25
  130. Shimano PD-A530 single-sided SPD pedals
    $15
    Boulder
  131. Panaracer Gravelking AC tires - 700c x 35 mm
    $40
    Boulder
  132. Porcelain Rocket Mr Fusion
    $150
  133. Bridgestone 450 frameset - Large
    $50
    Longmont
  134. Women's $150 Giro Reva Mountain bike shoes - EU 39 - LIKE NEW
    $50
    Longmont
  135. Brand New Black Inc Thirty Four wheelset
    $1,399
    Boulder
  136. Brand new in box Black Inc Forty Five Wheelset
    $1,399
    Boulder
  137. Shimano Ultegra 11 speed cassette
    $20
    Louisville
  138. Dura Ace 11 speed rear derailleur and brakes
    $50
    Louisville
  139. NEW! Mountain Bike Shoes, SPD - EU 40
    $50
    Longmont
  140. Garmin Edge 830.
    $195
    Boulder
  141. Yakima FullTilt 5 Bike Rack
    $100
    Louisville
  142. Shimano Ultegra 9 speed rear derailleur and cassette
    $25
    LONGMONT
  143. Road brakes: Shimano Tiagra
    $25
    LONGMONT
  144. Sram front and rear derailleurs (road)
    $30
    Longmont
  145. NEW 11spd 11-28 Shimano Dura-Ace CS-R9100 Cassette 9100
    $150
    South Boulder
  146. Burley Bee Bike Trailer
    $125
    Boulder
  147. 172.5 Shimano Dura-Ace FC-R9100-P 53-39 Crankset Power Meter
    $600
    South Boulder
  148. YAKIMA TUBETOP BICYCLE ADAPTER
    $25
    North Boulder Area
  149. Tacx® FLUX S Smart Trainer
    $400
    LOUISVILLE
  150. Racermate CompuTrainer Pro - Bike Trainer System ($1,500 new)
    $150
    Longmont
  151. Shimano RD86 Road Shoes
    $40
    Erie
  152. 2003-2009 4Runner Cargo Cover
    $80
    Louisville
  153. Bike Shoes - Cycling - Mt Biking - Men's/Women's
    $40
    Longmont
  154. Fabric Bike Seat new
    $20
    Lafayette
  155. Yakima 3 Bike Hitch Mount Tilting Vehicle Carrier Rack
    $100
    South Boulder
  156. KS CRUXi CRUX-INTEGRA dropper seat post
    $100
    Boulder
  157. Shimano ME400 Mountain Shoes (Women's) like new
    $45
    Boulder
  158. Pearl Izumi AmFib Shoe Covers/Warmers - Like New
    $30
    Boulder
  159. Womens bike shoes SPD sz 41 10
    $25
    Boulder
  160. Speedplay Magnum Cleats
    $15
    Boulder
  161. Clipless pedals
    $20
    Boulder
  162. Pearl Izumi X-Alp Seek Blue Women's Size 40 (9) Cycling Shoes NEW
    $70
    Boulder
  163. Berthoud Galibier leather/titanium saddle
    $180
    Boulder
  164. SRAM Code RSC Brake Set
    $350
  165. Timbuk2 Bikepacking Frame & Saddle Bags
    $125
  166. 🚲🚲🚲 Hitch Bike Rack (Saris) 🚲🚲🚲
    $150
    Longmont
  167. Kurt Kinetic Road Machine Indoor Bicycle Trainer
    $75
    South Boulder
  168. MTB parts for sale - parting out complete bike
    $1
    Gunbarrel
  169. Specialized air tool and bike stand
    $40
  170. New 160mm Fox 38 Factory Grip2 29" 44mm Mountain Bike Fork
    $600
    Boulder
  171. NEW 170mm FSA Omega MegaExo AGX+ Gravel Crankset 46/30 tooth & BB
    $70
    Boulder
  172. DEAN Torreys titanium gravel frame 62 cm
    $1,500
    Boulder
  173. CycleOps Fluid2 Indoor Bike Trainer & Tire
    $100
    Boulder
  174. Sidi Genius 10
    $250
    SW Longmont
  175. BIKE TRAINER: MagLite Elite stationary for back wheel/ xoearth et
    $80
    Boulder Central
  176. HELMET FLAGS: reflective helmet flags + bike sticker kit/ xoearth
    $14
    Boulder
  177. SHOES W8 Shimano/ FORKS 27.5 &26/ CLIMBING gear/ MASKS dive/ xoearth
    $25
    Boulder
  178. Solar Powered Bicycle Red LED Rear Tail Light Flashing or Static
    $13
    eBay
  179. Feedback Omnium Over-Drive Trainer—used once!
    $300
    Longmont
  180. Cateye Sumo 3 Bike Light
    $100
    Boulder
  181. SRAM XG 1275 10-52T Cassette
    $150
    Longmont
  182. Stans Arch MK3 29er Boost Wheelset
    $270
  183. RockShox SID Select Fork, 120mm
    $320
  184. Campagnolo Chorus Aero Seat Post 27.2
    $40
    N.E. Boulder
  185. Silca Track Pump with Brass Chuck
    $40
    N.E. Boulder
  186. KRYPTONONITE E-BIKE or Bike CHAIN INTEGRATED COMBINATION LOCK
    $80
    Boulder
  187. Bicycle Rack
    $30
    Boulder
  188. Thule T2 Pro XTR 4 Bike Rack w locks for 2" hitch
    $1,000
    Louisville
  189. Single Speed Freewheel
    $10
    Longmont
  190. Tektro Drop Bar Brake Levers
    $10
    Longmont
  191. Salsa Salt Flat Bars 700mm
    $20
    Longmont
  192. Cyclocross Tires
    $15
    Longmont
  193. Saris Wall-Mount Bike Storage Rack
    $15
    Longmont
  194. Bike Box
    $25
    Boulder
  195. Wahoo Kicker Smart Trainer, 9/10/11spd- Like New
    $400
    Boulder
  196. Cyclops Fluid 2 Trainer with Block( Mint Condition) $100
    $100
    Lafayette
  197. bicycle booties size 13
    $10
    Lafayette
  198. Thule 822 Bed Rider Truck Bike Mount Aluminium
    $140
    South Boulder
  199. Yakima 4 Bike Trailer Hitch Tilting Rack
    $120
    South Boulder
  200. Thule 4-Bike Hitch Rack
    $95
    Boulder
  201. TT and Road Helmets All Sizes
    $70
    Boulder
  202. Velocity A23 Clincher Rim Brake 11 Speed Rear Wheel
    $95
    Boulder
  203. Shimano Ultegra Carbon Disc Brake Wheel Set
    $450
    Boulder
  204. Ascent Fluid Trainer For sale ($30)
    $30
    Lafayette
  205. (New) Salsa Cowchipper Carbon 2.0 Handlebar 44cm
    $140
    BOULDER
  206. Shimano XT cranks
    $100
    Boulder
  207. 5.10 Flat mtb shoes
    $100
    Rollinsville
  208. Easton Haven/9point8 dropper post
    $60
    Boulder
  209. Specialized Rear Wheel 27.5" with Tire and Disc
    $100
    South Boulder
  210. Brand New - Shimano Ultegra R8170 DI2 disc group
    $1,350
    Boulder County
  211. 1994 Bridgestone MB-6 Frameset - 46cm
    $60
    Boulder
  212. Rock Shox 98 SID Service/ O Ring Kit NOS
    $15
    Erie
  213. PRO Falcon road saddle 142mm
    $30
    Longmont
  214. Whisky Stem 110mm
    $20
    Longmontt
  215. Hitch Mount Bicycle Carrier
    $50
    North Boulder Area
  216. Tri Bike Travel Case
    $250
    Boulder
  217. Maxxis Hard Drive TS Tubeless Tire - 26"
    $30
    South Boulder
  218. DT Swiss 466D EVO 27.5 Rear Wheel Set Bicycle
    $200
    South Boulder
  219. DT Swiss 4.0 Rear Wheel Set Road Bike
    $200
    South Boulder
  220. I9 Industry Nine Headset (Silver)
    $100
    Longmont
  221. Bicycle travel cases RENTAL - 4 different models
    $50
    Boulder
  222. 170mm KS Rage-i Dropper Post
    $50
  223. Spare 700c road bike wheels - front and rear
    $30
    Boulder
  224. 3T Superergo Tm Stlth Carbon handlebars
    $150
    Louisville
  225. Burley Thru Axle 12x1.0 142-148m
    $25
    Superior, CO
  226. Mavic Cosmic Pro SL Carbon Disc Brake Front Wheel
    $250
    Boulder
  227. Qty 2 : Specialized 24 x 2.4 - 3.0 Tubes
    $5
    Boulder
  228. Saris bike rack
    $75
    Boulder
  229. Panaracer Gravelking SK+ 700x43c tubeless tire pair
    $50
  230. Maxxis Aspen 29x2.4WT tire pair
    $65
  231. WTB Riddler 700x37c tubeless tire pair
    $50
  232. Continental GP5000 S TR 700x32 tire pair
    $85
  233. Panaracer Gravelking 700x32 tubeless tire pair
    $50
  234. Shimano XT RD 736
    $40
    Longmont
  235. Shimano Bike Cycling Shoes Mens 47 EU 2 bolt
    $40
    Boulder
  236. Rocky mounts trays w/ thru axle adapters
    $125
    NE Boulder
  237. Fizik Antares R3 Open bike saddle - Large 153 mm
    $90
  238. Weinmann XM25 MTB Rim with Tire and Disc -- 110mm Boost Hub
    $55
    South Boulder
  239. Alex Blizzerk 26" 90mm rim
    $30
    Boulder
  240. Mountain Bike Trail Tire - Diamondback 29″ x 2.1 Sortie
    $30
    Broomfield
  241. Mone Bi Plane Fork - La Roca tapered - steel mountain bike fork
    $300
    Boulder
  242. REDUCED Shimano Dura-Ace C60 Tubular Aero Wheels
    $1,000
    Gunbarrel
  243. Bike rack
    $100
    Hudson
  244. Fluid CycleOps Bike Trainer
    $40
    Lafayette
  245. Quill Stem with Removable Faceplate - 80mm length - Velo Orange
    $70
    LAFAYETTE
  246. 40T Sram Force AXS direct mount chainring
    $50
    Louisville
  247. Good condition tubeless tires
    $0
    Louisville
  248. Ratio Converted SRAM Force1 Hydarulic 12 Speed Shifter/Brakeset
    $150
    Boulder
  249. Bike Parts
    $5
    Boulder
  250. OEM Trek VW Rooftop Bicycle Racks
    $75
    South Boulder
  251. Feedback Omnium Over Drive Roller Trainer
    $300
    Boulder
  252. Wahoo KICKR CLIMB Bike Trainer Grade Simulator (New)
    $450
    LONGMONT
  253. Shimano GRX RX870 Carbon Gravel Wheelset
    $750
    Boulder
  254. Specialized Renegade control 29x1.95 2BLISS
    $25
  255. NEW Sweet Protection Outrider Helmet W Medium Dark Frost Ice Blue
    $30
    Boulder
  256. Shimano XT 10 sp cassette
    $35
    Longmont
  257. Shimano XT 11 sp Cassette
    $40
    Longmont
  258. WTB/Sram 27.5+ Wheels/Maxxis Rekon Tires
    $200
    Superior
  259. Vintage Kryptonite K3 U Lock with Keys
    $100
    South Boulder
  260. RACEFACE ARC OFFSET 30MM/DT SWISS 350 29" wheelset
    $600
    Louisville
  261. Peloton bike shoes - W size 9, M size 7
    $50
    LONGMONT
  262. Cold Weather Booties
    $10
    Boulder
  263. FORK: XCT SA Suntour for 27.5wheel disc black/ xoearth ET
    $20
    Boulder
  264. Rotor Q rings for XT/XTR
    $60
    Boulder
  265. Bike Trainer with Power Meter by Nashbar
    $30
    Longmont
  266. Bike Racks (Trunk Mount & Folding)
    $25
    Lafayette
  267. Vittoria Corsa Graphene 2.0 32 mm Tubeless Gumwall
    $100
  268. 2x Schwalbe ONE TLE 28 MM 700c Tubeless Tires
    $40
  269. Thule Fat Tire T2 Bike Rack Wheel Kit - Qnty 2
    $80
    Boulder
  270. Pearl Izumi X-Alp Elevate Mountain Bike - MTB - Shoes - Size 43.5
    $80
    South Boulder
  271. Road or MTB bike saddle - Prologo Nago ti 1.4 - Titanium rails
    $45
    Boulder-Denver-Longmont
  272. Specialized Road bike shoes, new
    $50
    south boulder
  273. Bike Repair Stand
    $0
    Longmont
  274. Lazer Vento KinetiCore Helmet, size L
    $180
    Boulder
  275. WTB i21 gravel wheelset, 700c, tubeless, thru-axle
    $150
    Boulder
  276. Ultegra 12 spd 11-30 cassettes, new and used
    $75
    Boulder
  277. Specialized Mt. Biking shoes
    $25
  278. Sidi Genius 10 Road Shoes, 46.5 white
    $80
    Louisville
  279. Kinetic Fluid Trainer + extra tire
    $30
    Louisville
  280. Specialized Toupe Comp Saddle
    $30
    Boulder
  281. Specialized Toupe Comp Saddle 155
    $40
    Boulder
  282. 2022 Ventum NS1
    $850
    Longmont
  283. Guide T Brakes
    $125
    Boulder
  284. Vintage USA Concord Bicycle Replacement Tube, Unused - 26 x 1.5
    $4
    Longmont
  285. AirShot Tubeless Tire Inflator
    $50
    se boulder